The Shimano SM-MA-R160P/S adapter allows the installation of Shimano Postmount caliper on frames with IS2000-Standard 140 mm direct style in conjunction with 160 mm rotors.
Product features - Shimano SM-MA-R160P/S

Frame type: IS2000-Standard (140mm)
Caliper type: Postmount
Rotor diameter: 160mm

Material

Adapter: Aluminium
Screws: Steel